EP3078636A1 - Magnetic hydrotalcite composite and process for manufacturing same - Google Patents

Magnetic hydrotalcite composite and process for manufacturing same Download PDF

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EP3078636A1
EP3078636A1 EP14867453.4A EP14867453A EP3078636A1 EP 3078636 A1 EP3078636 A1 EP 3078636A1 EP 14867453 A EP14867453 A EP 14867453A EP 3078636 A1 EP3078636 A1 EP 3078636A1
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Prior art keywords
hydrotalcite
mol
compound
magnetic
composite
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German (de)
English (en)
French (fr)
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Xing Dong Wang
Yoshihito IWAMOTO
Koichi Nedachi
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Kyowa Chemical Industry Co Ltd
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Kyowa Chemical Industry Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H—ELECTRICITY
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    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
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    • C01F7/00—Compounds of aluminium
    • C01F7/78—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
    • C01F7/784—Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
    • C01F7/785—Hydrotalcite
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    • C01G49/0009—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/20—Two-dimensional structures
    • C01P2002/22—Two-dimensional structures layered hydroxide-type, e.g. of the hydrotalcite-type
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Definitions

  • the present invention relates to a magnetic hydrotalcite composite which is useful as an adsorbent, electromagnetic wave absorbing agent or ultraviolet absorbing agent and a production method thereof.
  • Patent Document 1 discloses a method of synthesizing a hydrotalcite compound which can be used as an anion adsorbent by recycling steel slag which is industrial waste.
  • the hydrotalcite compound synthesized by this method is represented by the general formula [Ca 2+a-x MxAlO 3+b ]A y .
  • this hydrotalcite compound having this structure is calcined alone, the formed oxide agglomerates, thereby reducing activity. Since this compound has a single hydrotalcite structure, the type of an ion able to be adsorbed is limited.
  • Non-patent Document 1 discloses a method of treating selenium with Green Rust (GR) and a method of forming a hydrotalcite compound by using MgO as a neutralizer. To treat selenium and a fluorine ion by this method, two different types of hydrotalcite particles suitable for these treatments are required, respectively.
  • GR Green Rust
  • Patent Document 2 discloses a method of synthesizing a cleaning agent by compounding a hydrotalcite compound on the surface of magnesium oxide and a method of treating a harmful substance by using the cleaning agent.
  • the hydrotalcite compound synthesized by this method has the same disadvantage as above.
  • Non-patent Document 2 discloses the synthesis of a Fe-based hydrotalcite compound and application thereof. Since the particle synthesized by this method is a single-layer Fe-based hydrotalcite compound, it has the same disadvantage as above.
  • Patent Document 3 discloses a method of synthesizing a Co (II) Fe (III) -LDH particle having low coercive force.
  • the particle synthesized by this method is a Co(II)Fe(III)-LDH particle and a precursor of a CoFe-based ferrite substance. Since it has no CoFe ferrite structure, it cannot fully exhibit physical properties as a magnetic substance.
  • Patent Document 4 discloses a method of providing an ultraviolet absorbing function by introducing the anion of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (abbreviated as BP) between Mg-Al-NO 3 type hydrotalcite layers.
  • BP 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid
  • This method has a disadvantage that a waste liquid after exchange is colored deep yellow, whereby its treatment imposes a great burden on the environment.
  • the method has another disadvantage that use of the particle is limited since the particle after exchange is tinged with deep yellow.
  • Patent Document 5 discloses a method of preparing a vinyl chloride-based resin composition for use in transparent products by mixing zinc-modified hydrotalcite and 2,4-dihydroxybenzophenone with a resin. This method is used to provide an ultraviolet absorbing function to a resin by mixing zinc-modified hydrotalcite and 2,4-dihydroxybenzophenone having an ultraviolet absorbing function. This method has a disadvantage that when time passes, an organic substance having an ultraviolet absorbing function such as 2,4-dihydroxybenzophenone is decomposed gradually, thereby deteriorating the ultraviolet absorbing function.
  • Non-patent Document 1 Water treatment technique for a harmful element using an on-site forming method of a layered double hydroxide, J. Soc. Powder Technol. Japan, 50, 342-347 (2013 )
  • Non-patent Document 2 Synthesis and application of a Fe-based layered double hydroxide, Clay Science, Vol. 49, No. 3, p. 99-107, 2010
  • Hydrotalcite compounds have a disadvantage that when they are calcined, they agglomerate with the result of reduced activity. Since conventional hydrotalcite compounds have a single hydrotalcite structure, the type of an ion able to be adsorbed is limited.
  • the inventors of the present invention found that when a hydrotalcite compound is compounded with a ferrite compound, the agglomeration of the hydrotalcite compound can be prevented if it is calcined. When a plurality of metal ions are contained in the hydrotalcite compound, the hydrotalcite compound can adsorb a plurality of ions.
  • the present invention includes the following inventions.
  • the magnetic hydrotalcite composite of the present invention (may be referred to as "magnetic composite” hereinafter) is an inorganic-inorganic composite comprising two or more different types of inorganic particles.
  • the magnetic composite comprises an inner layer and an outer layer, the inner layer is made of a hydrotalcite compound, and the outer layer is made of a ferrite compound.
  • the hydrotalcite compound of the inner layer is a layered double hydroxide.
  • the content of the hydrotalcite compound in the inner layer is preferably 5 to 99.5 wt%.
  • the lower limit of the content in the inner layer is preferably 10 wt%, more preferably 15 wt%.
  • the upper limit of the content in the inner layer is preferably 90 wt%, more preferably 85 wt%.
  • the content of the ferrite compound in the outer layer is preferably 0.5 to 95 wt%.
  • the lower limit of the content in the outer layer is preferably 10 wt%, more preferably 15 wt%.
  • the upper limit of the content in the outer layer is preferably 90 wt%, more preferably 85 wt%.
  • the inner layer is preferably made of a hydrotalcite compound (layered double hydroxide) having anion exchange capability and represented by the following formula (1).
  • a hydrotalcite compound layered double hydroxide having anion exchange capability and represented by the following formula (1).
  • M 2+ and M 3+ are divalent and trivalent metal ions, respectively, and A n- is an n-valent anion.
  • the hydrotalcite compound containing M 2+ and M 3+ has the crystal structure of a hydroxide layer (host layer) similar to brucite [Mg(OH) 2 ] as a basic structure, and the host layer is charged positively by substituting part of the divalent metal by a trivalent metal, whereby an anion and a water molecule are inserted between layers (guest layers).
  • M 2+ is at least one divalent metal ion selected from the group consisting of Mg 2+ , Ca 2+ , Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Sr 2+ , Cd 2+ and Pb 2+ .
  • M 2+ is preferably at least one divalent metal ion selected from the group consisting of Mg 2+ , Ca 2+ , Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ .
  • M 3+ is at least one trivalent metal ion selected from the group consisting of La 3+ , Al 3+ , Ga 3+ , Mn 3+ , Co 3+ , Y 3+ , Ce 3+ , Fe 3+ , Cr 3+ and In 3+ .
  • M 3+ is preferably at least one trivalent metal ion selected from the group consisting of Al 3+ , Cr 3+ , Fe 3+ , Co 3+ , In 3+ , Y 3+ , Ce 3+ and La 3+ .
  • the atomic ratio of M 2+ and M 3+ of the hydrotalcite compound of the inner layer is 1.0:1.0 to 6.0:1.0, more preferably 1.3:1.0 to 5.5.0:1.0, much more preferably 1.5:1.0 to 5.0:1.0.
  • a n- is an anion inserted between the layers of the hydrotalcite compound of the inner layer.
  • a n- include inorganic anions such as carbonate ion (CO 3 2- ), sulfate ion (SO 4 2- ), chloride ion (Cl - ) , silicate ion (SiO 3 2- ), phosphate ion (PO 4 2- ), nitrate ion (NO 3 - ) and hydroxide ion (OH - ), organic phosphoric acids such as methyl phosphate (CH 3 PO 4 2- ) organic carboxylic acids such as oxalate ion (C 2 O 4 2- ), formate ion (HCOO - ) and acetate ion (CH 3 COO - ), and organic sulfonic acids such as methane sulfonic acid (CH 3 SO 3 - ).
  • inorganic anions such as carbonate ion (CO 3 2- ), sulfate
  • a n- is preferably at least one n-valent anion selected from the group consisting of CO 3 2- , SO 4 2- , Cl - , SiO 3 2- , PO 4 3- , NO 3 - , OH - , CH 3 PO 4 2- , C 2 O 4 2- , HCOO - , CH 3 COO - and CH 3 SO 3 - .
  • x satisfies 0.1 ⁇ x ⁇ 0.6.
  • the lower limit of “x” is preferably 0.15, more preferably 0.2.
  • the upper limit of "x” is preferably 0.5, more preferably 0.4.
  • the outer layer is preferably made of a ferrite compound represented by the following composition formula (2-1), (2-2) or (2-3).
  • the ferrite compound is a precursor particle or crystal particle of at least one ferrite substance selected from the group consisting of spinel ferrite, hexagonal ferrite and garnet ferrite.
  • the spinel ferrite is represented by the following composition formula (2-1).
  • AFe 2 O 4 (2-1) (In the above formula, A is at least one selected from the group consisting of Ni, Zn, Cu, Mn, Co and Mg.)
  • the hexagonal ferrite is represented by the following composition formula (2-2).
  • XFe 12 O 19 (2-2) (In the above formula, X is at least one selected from the group consisting of Sr, Ba and Pb.)
  • the garnet ferrite is represented by the following composition formula (2-3).
  • RFe 5 O 12 (2-3) (In the above formula, R is a rare earth element in the fourth to sixth periods excluding actinoid of group 3 in the Periodic Table.)
  • the salt of at least one precious metal element selected from the group consisting of Au, Ag, Ru, Pt, Rh, Ir, Rb, Os and Pd should be supported on the outer layer in an amount of 0.2 to 5.0 wt% as a precious metal element.
  • the magnetic composite can be produced by preparing the hydrotalcite compound of the inner layer (step (1)), precipitating a ferrite compound on the obtained hydrotalcite compound to prepare a precursor (step (2)), and baking the precursor (step (3)).
  • the step (1) is to produce a hydrotalcite compound at 20 to 270°C by mixing a metal salt containing an element constituting the hydrotalcite compound of the inner layer with an alkaline solution to control the pH value of the resulting solution to 7 to 11.
  • a soluble metal salt may be used as a source of the divalent metal ion (M 2+ ) constituting the hydrotalcite compound of the inner layer.
  • the soluble metal salt is a chloride, nitric acid salt or sulfuric acid salt. Examples thereof include MgCl 2 , CaCl 2 , ZnCl 2 , FeCl 2 , Mg(NO 3 ) 2 , Ca(NO 3 ) 2 , Zn(NO 3 ) 2 , Fe(NO 3 ) 2 , MgSO 4 , ZnSO 4 and FeSO 4 .
  • a hydroxide, oxide or metal powder may also be used besides the soluble metal salt compounds. Examples thereof include MgO, ZnO, Mg(OH) 2 , Al(OH) 3 , Al 2 O 3 , metal Zn powder, metal Al and Mg powder.
  • a soluble metal salt may be used as a source of the trivalent metal ion (M 3+ ) constituting the hydrotalcite compound of the inner layer.
  • the soluble metal salt is a chloride, nitric acid salt or sulfuric acid salt. Examples thereof include AlCl 3 , Al(NO 3 ) 3 and Al 2 (SO 4 ) 3 .
  • An oxide, metal or hydroxide may also be used besides the soluble metal salt compounds. Examples thereof include metal Al powder, Al(OH) 3 , Al 2 O 3 powder, Fe 2 O 3 powder and metal Fe powder.
  • Examples of the source of the n-valent anion constituting the hydrotalcite compound of the inner layer include inorganic anions such as carbonate ion (CO 3 2- ), sulfate ion (SO 4 2- ), chloride ion (Cl - ) , silicate ion (SiO 3 2- ), phosphate ion (PO 4 3- ), nitrate ion (NO 3 - ) and hydroxide ion (OH - ), organic phosphoric acid salts such as methyl phosphate (CH 3 PO 4 2- ), organic carboxylic acid salts such as oxalate ion (C 2 O 4 2 ), formate ion (HCOO - ) and acetate ion (CH 3 COO - ), and organic sulfonic acid salts such as methane sulfonic acid (CH 3 SO 3 - ).
  • the salts include sodium salts, potassium salts and ammonium salts.
  • alkaline solution examples include NaOH, KOH and NH 3 ⁇ H 2 O.
  • a reaction is carried out by controlling the pH value of the resulting solution to 6 to 12.
  • the lower limit of the pH value is preferably 6.5, more preferably 7.
  • the upper limit of the pH value is preferably 11.5, more preferably 11.
  • the ratio of the soluble salt of the divalent metal (M 2+ ) to the soluble salt of the trivalent metal (M 3+ ) is preferably such that the atomic ratio of the M 2+ and M 3+ of the obtained hydrotalcite compound becomes 1.0:1.0 to 6.0:1.0.
  • the reaction may be carried out by a wet process.
  • a coprecipitation, hydrothermal or uniform sedimentation process may be advantageously used.
  • the hydrotalcite compound may be obtained as a powdery particle by these processes.
  • the reaction temperature is preferably 20 to 270°C, more preferably 40 to 200°C, much more preferably 60 to 180°C.
  • the step (2) is to produce a precursor by adding an acidic solution of a metal salt containing an element constituting the ferrite compound of the outer layer and an alkaline solution to slurry containing the obtained hydrotalcite compound to control the pH value of the resulting solution to 7 to 11 so as to form the outer layer at 40 to 250°C.
  • a soluble metal salt may be used as the metal salt containing an element constituting the ferrite compound of the outer layer.
  • the soluble metal salt is a chloride or oxide. Examples thereof include FeCl 3 , MgCl 2 , Ni(NO 3 ), ZnCl 2 , MgO, ZnO, Fe(NO 3 ) 3 , Zn(NO 3 ) 2 and Mg(NO 3 ) 2 .
  • alkaline solution examples include NaOH, KOH, NH 3 H 2 O and Na 2 CO 3 .
  • the reaction is carried out by controlling the pH value of the solution to 7 to 12.
  • the lower limit of the pH value is preferably 8, more preferably 9.
  • the upper limit of the pH value is preferably 11.
  • the reaction temperature is preferably 20 to 250°C, more preferably 40 to 200°C, much more preferably 60 to 180°C.
  • the precursor of the magnetic composite particle can be obtained by compounding the precursor or crystal particle of the hydrotalcite compound of the inner layer with the precursor or crystal particle of the ferrite compound of the outer layer by a complex polymerization, coprecipitation, hydrothermal or uniform sedimentation process.
  • the salt of at least one precious metal element selected from the group consisting of Au, Ag, Ru, Pt, Rh, Ir, Rb, Os and Pd may be supported on the outer layer of the precursor in an amount of 0.2 to 5.0 wt% as a precious metal element.
  • the step (3) is to calcine the precursor at a temperature range of 200 to 800°C.
  • the calcination temperature is 200 to 1,500°C, preferably 250 to 1,300°C, much more preferably 300 to 1,100°C.
  • the calcination time is 1 to 30 hours, preferably 1.5 to 20 hours, much more preferably 2 to 15 hours.
  • air, nitrogen gas, argon gas or hydrogen gas may be used but air is generally used.
  • the magnetic composite of the present invention may be used as an adsorbent for harmful substances contained in soil, underground water or wastewater. It may also be used as an electromagnetic wave absorbing agent or ultraviolet absorbing agent.
  • the precursor or crystallized particle of the hydrotalcite compound of the inner layer preferably contains Al 3+ .
  • the precursor or crystallized particle of the hydrotalcite compound of the inner layer preferably contains Fe 3+ .
  • This solution containing a precipitate was kept at 40°C and stirred for 1.0 hour, a hydrothermal treatment was carried out at 170°C in an autoclave having a capacity of 1.0 L for 8 hours, and then the precipitate was separated by filtration, rinsed and dried at 185°C to obtain 45 g of a hydrotalcite compound powder.
  • the obtained powder had a hydrotalcite structure. Further, as a result of analysis with a fluorescent X-ray measurement instrument (Rigaku X-ray Spectrometer RIX2000), the obtained powder was an Mg-Al-based Cl type hydrotalcite compound comprising 44.47 wt% of MgO, 18.7 wt% of Al 2 O 3 and 13.25 wt% of chlorine and represented by the composition formula Mg 5.99 Al 2 (OH) 15.95 (Cl) 2.00 .
  • Sample 4 was obtained in the same manner as in Example 2 except that the hydrothermal treatment was carried out at 120°C for 8 hours in the synthesis of inner-layer hydrotalcite.
  • Sample 5 was obtained in the same manner as in Example 2 except that the hydrothermal treatment was carried out at 150°C for 8 hours in the synthesis of inner-layer hydrotalcite.
  • This solution containing a precipitate was stirred at 40°C and 350 rpm for 1.0 hour, and then the precipitate was washed with 1.0 L of a 0.075 mol/L Na 2 CO 3 aqueous solution. Thereafter, a hydrothermal treatment was carried out at 150°C in an autoclave having a capacity of 1.0 L for 8 hours, and then the precipitate was separated by filtration, rinsed and dried at 185°C to obtain 42.8 g of a hydrotalcite powder.
  • the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Mg-Al-based CO 3 type hydrotalcite compound comprising 45.33 wt% of MgO, 19.14 wt% of Al 2 O 3 and 11.49 wt% of CO 3 2- and represented by the composition formula Mg 5.99 Al 2 (OH)15.98(CO 3 ) 1.02 .
  • Sample 11 was obtained in the same manner as in Example 9 except that the hydrothermal treatment was carried out at 120°C for 8 hours in the synthesis of inner-layer hydrotalcite.
  • the obtained powder had a hydrotalcite structure.
  • the obtained Ca-Al-based Cl type hydrotalcite was analyzed with a fluorescent X ray, it was a Ca-Al-based Cl type hydrotalcite compound comprising 45.75 wt% of CaO, 20.90 wt% of Al 2 O 3 and 14.53 wt% of chlorine and represented by the composition formula Ca 3.98 Al 2 (OH) 11.96 (Cl) 2.00 .
  • the obtained Zn, Fe-Fe-based Cl type hydrotalcite powder was a Zn, Fe-Fe-based Cl type hydrotalcite compound comprising 29.33 wt% of ZnO, 27.26 wt% of FeO, 19.17 wt% of Fe 2 O 3 and 8.51 wt% of chlorine, having an atomic ratio of [Zn+Fe(II)] and Fe(III) of 3.08:1 and represented by the composition formula Zn 3.00 Fe(II) 3.16 Fe(III) 2 (OH) 16.32 (Cl) 2.00 .
  • An Mg-Al-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 1 except that the compounding of the MgFe 2 O 4 -based particle and calcination were not carried out.
  • An Mg-Al-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 4 except that the compounding of the MgFe 2 O 4 -based particle and calcination were not carried out.
  • An Mg-Al-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 5 except that the compounding of the MgFe 2 O 4 -based particle and calcination were not carried out.
  • An Mg-Fe-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 6 except that 2 hours of calcination at 400°C in an air atmosphere was not carried out.
  • An Mg-Al-based CO 3 type hydrotalcite compound particle was prepared in the same manner as in Example 8 except that the compounding of the Ni 0.6 Zn 0.4 Fe 2 O 4 -based particle and 2 hours of calcination at 550°C in an air atmosphere were not carried out.
  • a Ca-Al-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 8 except that the hydrothermal treatment was carried out at 120°C for 8 hours and the compounding of the Ni 0.6 Zn 0.4 Fe 2 O 4 -based particle and 2 hours of calcination at 550°C in an air atmosphere were not carried out.
  • a Ca-Al-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 12 except that the compounding of the MgFe 2 O 4 -based particle and 2 hours of calcination at 500°C in an air atmosphere were not carried out.
  • a Zn,Fe-Fe-based Cl type hydrotalcite compound particle was prepared in the same manner as in Example 13 except that the compounding of the (Mg 0.6 Ca 0.4 )Fe 2 O 4 -based particle and 2 hours of calcination at 400°C in an air atmosphere were not carried out.
  • Aqueous solution containing 85 mg/L-Cr 2 O 7 2- 1,000 ml of an aqueous solution containing 0.1158 g of K 2 Cr 2 O 7 which is a standard substance for Wako volumetric analysis was prepared.
  • Aqueous solution containing 65 mg/L phosphate ion: 1,000 ml of an aqueous solution containing 0.095 g of Wako reagent NaH 2 PO 4 ⁇ H 2 O was prepared.
  • KW-300S and KW-500SH are 1.25Mg-Al-based CO 3 type and 2Mg-Al-based CO 3 type hydrotalcites, respectively.
  • the magnetic hydrotalcite composite particle of the present invention has excellent adsorption capability.
  • the pH value of the suspension of the particle is not less than 10, and it is conceivable that a heavy metal ion may cause a reaction with the surface of each particle and ion exchange may be carried out between the hydrotalcite layers of the inner layer. Since the ferrite particle of the outer layer has positive charge, an ion which is rarely reactive at a given pH, such as Cr 2 O 7 2- (or CrO 4 2- ) may be adsorbed by the ferrite particle of the outer layer or ion exchanged between the hydrotalcite layers of the inner layer.
  • the hydrotalcite particle when the particle is rehydrated after it adsorbs an ion such as Cr 2 O 7 2- (or CrO 4 2- ), it re-elutes 5 ppm of Cr 6+ .
  • the magnetic hydrotalcite composite particle does not elute Cr 6+ .
  • the obtained powder had a hydrotalcite structure.
  • the obtained hydrotalcite was analyzed with a fluorescent X ray, it was an Mg-Al-based CO 3 type hydrotalcite compound comprising 64.99 wt% of NiO, 11.04 wt% of Al 2 O 3 and 6. 50 wt% of CO 3 2- and represented by the composition formula Ni 8.10 Al 2 (OH) 20.2 (CO 3 ) 2 .
  • the obtained powder had a hydrotalcite structure. Further, when the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Cu-Fe-based CO 3 type hydrotalcite compound comprising 50.51 wt% of CuO, 25.35 wt% of Fe 2 O 3 and 9.53 wt% of CO 3 2- and represented by the composition formula Cu 4 Fe 2 (OH) 12 CO 3 .
  • the obtained powder had a hydrotalcite structure. Further, when the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Cu-Cr-based CO 3 type hydrotalcite compound comprising 51.14 wt% of CuO, 24.42 wt% of Cr 2 O 3 and 9.64 wt% of CO 3 2- and represented by the composition formula Cu 4 Cr 2 (OH) 12 CO 3 .
  • the obtained powder had a hydrotalcite structure.
  • the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Ni,Co,Mg-Al-based CO 3 type hydrotalcite compound comprising 9.34 wt% of NiO, 1.34 wt% of CoO, 37.46wt% of MgO, 18.22 wt% of Al 2 O 3 and 10.73 wt% of CO 3 2- and represented by the composition formula Ni 0.70 Co 0.10 Mg 5.22 Al 2 (OH) 16.04 CO 3 .
  • Ni,Co,Mg-Al-based CO 3 type hydrotalcite powder was added to 500 ml of deionized water and dispersed at 40°C for 1 hour, 250 ml of an aqueous solution containing 1.48 g (0.005 mol, 98.0 % Wako special grade reagent) of Ni(NO 3 ) 2 ⁇ 6H 2 O, 1.49 g (0.005 mol, 98.0 % Wako special grade reagent) of Co (NO 3 ) 2 ⁇ 6H 2 O and 8.16 g (0.
  • Ni-Co-based magnetic/Ni,Co,Mg-Al-based CO 3 type hydrotalcite precursor powder 15 g was calcined at 450°C for 2 hours in an air atmosphere and naturally cooled to obtain 11.5 g of a composite particle of the Ni-Co-based magnetic/Ni,Co,Mg-Al-based CO 3 type hydrotalcite compound.
  • the above particle was immersed in the same volume of a 0.01 mol/L K 2 CO 3 aqueous solution at room temperature and dried at 110°C for 15 hours to obtain a composite particle of a potassium (K) modified Ni-Co-based magnetic/Ni,Co,Mg-Al-based CO 3 type hydrotalcite compound as Sample 17.
  • the obtained powder had a hydrotalcite structure. It could be confirmed by X-ray diffraction analysis with a copper K ⁇ ray that the obtained powder had a hydrotalcite structure.
  • the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Ni,Mg-Al-based CO 3 type hydrotalcite compound comprising 12.15 wt% of NiO, 42.65 wt% of MgO, 20.75 wt% of Al 2 O 3 and 12.21 wt% of CO 3 2- and represented by the composition formula Ni 0.80 Mg 5.21 Al 2 (OH) 16.02 CO 3 .
  • Ni,Mg-Al-based CO 3 type hydrotalcite powder was added to 500 ml of deionized water and dispersed at 40°C for 1 hour, 250 ml of an aqueous solution containing 1.22 g (0.007 mol, 97.0 % Wako reagent) of MnSO 4 ⁇ H 2 O, 0.73 g (0.003 mol, 99.9 % Wako special grade reagent) of Cu(NO 3 ) 2 ⁇ 3H 2 O and 8.16 g (0.02 mol, 99.0 % Wako special grade reagent) of Fe(NO 3 ) 3 ⁇ 9H 2 O and 22.86 ml (0.08 mol) of a 3.
  • the resulting solution was aged at 40°C for 1 hour, and then the obtained precipitate was separated by filtration, rinsed and dried at 105°C to obtain an Au-[Mn-Cu-Fe]-based magnetic/Ni,Mg-Al-based CO 3 type hydrotalcite precursor powder.
  • the content of Au was 1.0 wt%.
  • a Ni 0.5 Co 0.5 Fe 2 O 4 -Ni 0.7 Co 0.1 Mg 5.2 Al 2 (OH) 16 CO 3 ⁇ 4H 2 O composite particle was prepared in the same manner as in Example 17.
  • Example 10 The method of preparing a particle before exchange was the same as in Example 10 (Sample 10).
  • Ni-Co-based magnetic/Cu-Fe-based CO 3 type hydrotalcite composite precursor powder 50 g was calcined at 500 °C for 2 hours in an air atmosphere and naturally cooled to obtain 38 g of a Ni-Co-based magnetic/Cu-Fe-based CO 3 type hydrotalcite compound particle as Sample 21.
  • the above hydrotalcite composite precursor particle was dried at 200°C in an air atmosphere and calcined at 700°C for 2 hours in an air atmosphere to obtain Sample 22.
  • the resulting solution was aged at 37°C for 30 minutes under agitation, and then the obtained precipitate was separated by filtration, rinsed and dried at 185°C to obtain 90 g of a Zn-Fe-based CO 3 type hydrotalcite powder.
  • the obtained hydrotalcite was analyzed with a fluorescent X ray, it was a Zn-Fe-based CO 3 type hydrotalcite compound comprising 58.40 wt% of ZnO, 19.10 wt% of Fe 2 O 3 and 7.18 wt% of CO 3 2- and represented by the composition formula Zn 6.02 Fe 2 (OH) 16.04 CO 3 .
  • Ni-Mn-based magnetic/Zn-Fe-based CO 3 type hydrotalcite precursor was calcined at 500°C for 2 hours in an air atmosphere and naturally cooled to obtain Sample 23.
  • An Mg-Al-based CO 3 type hydrotalcite particle was prepared in the same manner as in Example 14. However the NiFe 2 O 4 -based particle containing an excessive amount of Ni was not compounded.
  • a Cu-Fe-based CO 3 type hydrotalcite particle was prepared in the same manner as in Example 15. However the CuFe 2 O 4 -based particle was not compounded.
  • a Cu-Cr-based CO 3 type hydrotalcite particle was prepared in the same manner as in Example 16. However the CuFe 2 O 4 was not compounded.
  • a Ni, Co, Mg-Al-based CO 3 type hydrotalcite particle was prepared in the same manner as in Example 17. However the Ni 0.5 CO 0.5 Fe 2 O 4 was not compounded.
  • a Ni,Mg-Al-based CO 3 type hydrotalcite particle was prepared in the same manner as in Example 18. However the Mn 0.7 Cu 0.3 Fe 2 O 4 (10.0 wt%) was not compounded.
  • a particle was prepared in the same manner as in Example 19. However the Ni 0.5 Co 0.5 Fe 2 O 4 (10.0 wt%) was not compounded.
  • the light absorbing effects measured with a spectrophotometer (HITACHI U-4100 Spectrophotometer) of samples having a diameter of 3 cm and a thickness of 3 mm prepared by molding powders are shown in Fig-9.
  • the composite particles of Example 14 and Example 23 exhibited strong reflection for infrared radiation having a wavelength of 1,395 to 1,700 nm.
  • DHT6 of Kyowa Chemical Industry Co., Ltd. which is Ma-Al-based CO 3 type hydrotalcite
  • the composite particles of Example 14 and Example 23 exhibited strong absorption for UV-A waves (315 to 380 nm), UV-B waves (280 to 315 nm) and UV-C waves (up to 280 nm).
  • the particles of Examples 14 to 23 exhibited strong magnetic property.
  • the results of checking the existence of magnetic property with a magnet of each particle before and after compounding are shown in Table 5.
  • Example 21 After 60 wt% of each of the particles of Example 21 and Comparative Example 10 was kneaded with 40 wt% of linear low-density polyethylene and the kneaded product was molded into a sample measuring 10 cm x 14 cm x 0.2 cm, the electromagnetic wave absorbing effect of the molded product was measured by a free-space method. As a result, as shown in Fig. 10 , it was confirmed that the obtained products had an electromagnetic wave absorbing effect.
  • the sample of Example 21 exhibited stronger absorption than the sample of Comparative Example 10.
  • the measurement result of magnetic moment of the composite particle of Example 22 with an oscillation type magnetometer is shown in Fig. 11 .
  • the composite particle was magnetized under the application of a magnetic field.
  • FIG. 12 A photo for confirming the existence of magnetic force of the particle of Example 22 by using a magnet when it was put into a chucked polyethylene bag measuring 5 cm x 7 cm x 0.04 cm is shown in Fig. 12 .
  • the particle of the present invention can be expected to be used as an ultraviolet absorbing agent or odor gas absorbing agent in addition to an electromagnetic wave absorbing agent. For example, it is effective for acid gases such as NH 3 and H 2 S.
  • a composite particle after exchange with KMnO 4 for example, the composite particle of Example 20 has an absorbing effect for a gas such as CH 2 CH 2 .
  • the particle of the present invention has the property of exchanging with an anion
  • a new function can be added to the composite particle of the present invention.
  • a BrO 3 - anion can be introduced between hydrotalcite layers. Since the BrO 3 - anion has strong reducing property, it can be expected to be used as a wastewater treating agent containing H 2 O 2 , N,N-dimethyl-4-(phenyldiazenyl)benzenamine (C 14 H 15 N 3 ) or 4-dimethylaminoazobenzene-4-sulfonic acid sodium salt (C 14 H 14 N 3 NaO 3 S, methyl orange).
  • the magnetic hydrotalcite composite of the present invention rarely agglomerates during calcination and has high dispersibility and high activity. When it is used as a catalyst, its recyclability is high.
  • the magnetic hydrotalcite composite of the present invention can adsorb a plurality of ions with high efficiency.
  • the production method of the magnetic hydrotalcite composite of the present invention by precipitating a ferrite substance on the surface of a hydrotalcite compound, agglomeration in the calcination step is suppressed, the surface activity of the hydrotalcite compound after calcination is improved, and recyclability can be improved when it is used as a catalyst.
  • the magnetic hydrotalcite composite of the present invention can be used as an adsorbent for harmful substances contained in soil, underground water or wastewater, electromagnetic wave absorbing agent or ultraviolet absorbing agent.

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CN102580663A (zh) * 2012-02-21 2012-07-18 上海大学 一种高磁性复合材料的制备方法及其应用
CN102945717A (zh) * 2012-10-11 2013-02-27 上海大学 复合型磁性材料及其制备方法

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CN109174952A (zh) * 2018-07-27 2019-01-11 江苏隆昌化工有限公司 一种镉铅污染农田钝化加低积累植物修复方法

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CL2016000404A1 (es) 2016-08-19
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WO2015083840A1 (ja) 2015-06-11
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